Hypothetically: which units from Heroes of Might and Magic II would you replace?

I would consider increasing the movement speed of peasants to 3 and increasing the cost of red dragons to 2 sulfur. I would also reduce the growth rate of vampires by 1 and possibly increase the cost of their upgrade or introduce a prerequisite for building the vampire upgrade. Perhaps I would slightly reduce the upper limit of the starting army size for Barbarians and Warlocks, although maybe not.